Mini Subwoofer - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th March 2008, 02:02 AM   #1
diyAudio Member
 
Join Date: Nov 2004
Location: Florida
Default Mini Subwoofer

I'm wanting to build a mini portable sound system for work, home, or whereever. I want it to have good sound for the size, and most small speaker lack in bass. I'll be using a 4 channel BTL Car Radio IC to drive the front speakers and sub.

I found this small sub at Parts Express:
http://www.partsexpress.com/pe/showd...number=264-831

The idea, was to use a pair of rare 2 1/4" 5W drivers for L & R and use the sub inside the box for bottom end.

Anyone here use this sub before. I'm not going for really loud output, but the low 82db efficiency has my attention, and I'm wondering if it will still be louder than an avg boombox.

Also, are there any other small subs out there that may do as well? I'd rather have a 2 ohm sub if I can find one.
  Reply With Quote
Old 25th March 2008, 03:00 AM   #2
diyAudio Member
 
Join Date: Nov 2004
Location: Florida
For more info, I'll be giving the sub 16W RMS @ 4 ohm

Front channels 8W RMS @ 8 ohm per channel. Should be 32W RMS total with 2 speakers and subwoofer. Also will have 14.4V of batteries inside the unit for portable use.
  Reply With Quote
Old 25th March 2008, 03:06 AM   #3
y8s is offline y8s  United States
diyAudio Member
 
y8s's Avatar
 
Join Date: May 2006
Send a message via AIM to y8s Send a message via MSN to y8s Send a message via Yahoo to y8s
use 4? that'd raise your sensitivity
  Reply With Quote
Old 25th March 2008, 03:47 AM   #4
diyAudio Member
 
Join Date: Nov 2004
Location: Florida
Quote:
Originally posted by y8s
use 4? that'd raise your sensitivity
And also won't be so mini anymore

I was thinking about two of them, but I'm really wanting this to be small, so I want to stick with one sub. I want the box to be 7 or 8 inch cube max, just big enough for a portable FM/CD player to fit on top.

The sub has over 9mm of Xmax, so I'm thinking even if it's not loud, it should still add some much needed bass. I've never seen a 5 inch sub like that before.
  Reply With Quote
Old 25th March 2008, 05:00 PM   #5
CarlosT is offline CarlosT  United States
diyAudio Member
 
Join Date: Oct 2006
You're gonna make this a sealed box then? Those are pretty small dimensions...your target cube box...
  Reply With Quote
Old 25th March 2008, 08:51 PM   #6
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Default Re: Mini Subwoofer

Quote:
Originally posted by EWorkshop1708
and I'm wondering if it will still be louder than an avg boombox.
Not as loud but the potential to go deeper and sound better. I use it's big brother the W6-1139 and am surprised how well it handles the lows.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 27th March 2008, 01:49 AM   #7
diyAudio Member
 
Join Date: Nov 2004
Location: Florida
That's cool. Glad you have had good experience with their small subs.

I don't need it super loud, just good sound. It will mainly be used at work for portable sound, or at home for sound at my spare computer. Or to have sound in one of my cars that has no stereo. I'm hoping this type of sub will sound good. I want at least a good 50-60hz bass note from this thing. Lower is a bonus, but not necessary.

That sub is rated close to 0.25 cu ft, so my small box should be fine. I want to make sealed on the backside of the woofer, with a small vented chamber on the front side, kind of like a bandpass, but open, for the bass to come out of. This is to protect the woofer, and try to get some more output. Feel free to comment on the box needed for a small subwoofer.

I want to stick with the 14.4V NiCd battery, to get good output. I'll just have a 12V 4A (17V unreg) transformer providing the charge for the battery, and to provide mains power for the amp. I'll use the batteries like big filter caps for the DC power coming in, and it will keep the batteries slowly charged and topped off at the right volts.

The Car Radio the IC amp come from had max power rating at 4 ohms a channel of 40W x 4 @ 14.4V (16W RMS x 4) So using 2 8 ohm speakers (8WRMS x 2) and a single 4 ohm subwoofer (16WRMS) should use about 1/2 the total wattage of the IC (32W RMS) with IMO should still be pretty loud, but not kill my batteries.

IC HA13158A is the amplifier.
  Reply With Quote
Old 27th March 2008, 02:04 AM   #8
DaveCan is offline DaveCan  Canada
diyAudio Member
 
DaveCan's Avatar
 
Join Date: Nov 2005
Location: Moncton NB
This small sub may be a better choice http://www.edesignaudio.com/product_...products_id=33
Dave
  Reply With Quote
Old 27th March 2008, 04:12 PM   #9
diyAudio Member
 
sdclc126's Avatar
 
Join Date: Jan 2005
Location: San Diego, CA
Default Have Them In My Car

EWorkshop1708 - for what it's worth, I have a pair of W5-1138SMs in my car, a Ford Focus 3-door. I put them on the rear two channels in the factory locations.

The efficiency is an issue, so I've adjusted the amp gain, but I can say that they are very clean and accurate - I listen to a lot of classical music and they have no trouble with pipe organ and bass drum, etc. - they don't seem to miss anything down in the low end. I may put an 8" third sub in my trunk area (5-channel amp) to see what difference it makes, just as an experiment.

I wouldn't recommend them for high SPLs with things like rap music and synthesized base, but for small systems and limited space applications they are quite appropriate.
__________________
Soft Dome
  Reply With Quote
Old 27th March 2008, 04:50 PM   #10
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by EWorkshop1708


That sub is rated close to 0.25 cu ft, so my small box should be fine.
I want to make sealed on the backside of the woofer, with a small vented chamber on the front side, kind of like a bandpass, but open, for the bass to come out of. This is to protect the woofer, and try to get some more output. Feel free to comment on the box needed for a small subwoofer.


Hi,

An 8" cube of 1/2" stock is 0.2 cuft Q=0.75, 3/4" 0.16cuft Q=0.8.
Bass in boombox context is very good, f6 at 50Hz, f10 at 40Hz.

Given this I cannot see why the volume penalty of a bandpass
arrangement, especially as the sub might need to go quite high
presuming that the 2 1/4" drivers will not do low.

/sreten.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
the Very Mini Magico Mini zei Multi-Way 7 11th February 2008 08:10 PM
Mini Subwoofer. Destroyer OS. Subwoofers 29 6th January 2006 11:04 PM
would a chip amp work on a mini subwoofer PimpMyRide Chip Amps 4 15th November 2005 11:00 AM
how to connect a non powered subwoofer to a stereo system without a subwoofer output JSD777 Multi-Way 4 20th September 2005 03:19 PM


New To Site? Need Help?

All times are GMT. The time now is 06:46 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2